Vortices with antiferromagnetic cores in the SO(5) model of high-temperature superconductivity

S. Alama; A. J. Berlinsky; L. Bronsard; T. Giorgi

doi:10.1103/PhysRevB.60.6901

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Vortices with antiferromagnetic cores in the SO(5) model of high-temperature superconductivity

S. Alama, A. J. Berlinsky, L. Bronsard, T. Giorgi

DOI 10.1103/PhysRevB.60.6901 · Physical Review B

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Abstract

We consider the problem of superconducting Ginzburg-Landau (GL) vortices with antiferromagnetic cores which arise in Zhang’s SO(5) model of antiferromagnetism (AF) and high-temperature superconductivity (SC). This problem was previously considered by Arovas et al. who constructed approximate “variational” solutions, in the large κ limit, to estimate the domain of stability of such vortices in the temperature-chemical potential phase diagram. By solving the GL equations numerically for general κ, we show that the amplitude of the antiferromagnetic component at the vortex core decreases to zero continuously at a critical value of the AF-SC anisotropy (g≈0.25) which is essentially independent of κ for large κ. The magnetic field profile, the vortex line energy and the value of the B field at the center of the vortex core, as functions of anisotropy are also presented.